Monthly Historical AveragesPort Jefferson, NY
Average Temperature
High
20°
Feels 20
Low
11°
Feels 10
Average Precipitation
11 Days
81.5mm
0cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastMonday, May 18, 2026
Day
26°Feels 26
Wind
19 km/h E
Gust
35 km/h
Humidity
51%
P.O.P
10%
Night
19°Feels 19
Wind
19 km/h SW
Gust
37 km/h
Humidity
83%
P.O.P
30%
Historical AveragesMay 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity